EP0874921A1 - Verfahren und vorrichtung zum elektrochemischen behandeln langgestreckter gegenstände - Google Patents
Verfahren und vorrichtung zum elektrochemischen behandeln langgestreckter gegenständeInfo
- Publication number
- EP0874921A1 EP0874921A1 EP97940064A EP97940064A EP0874921A1 EP 0874921 A1 EP0874921 A1 EP 0874921A1 EP 97940064 A EP97940064 A EP 97940064A EP 97940064 A EP97940064 A EP 97940064A EP 0874921 A1 EP0874921 A1 EP 0874921A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- electrode
- treated
- sealing means
- treatment
- electrochemically
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 238000007654 immersion Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 15
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 239000000565 sealant Substances 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000000284 resting effect Effects 0.000 claims 1
- 230000001681 protective effect Effects 0.000 abstract description 5
- 239000011796 hollow space material Substances 0.000 abstract 3
- 238000007598 dipping method Methods 0.000 abstract 1
- 238000000576 coating method Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 7
- 238000001465 metallisation Methods 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 229920003023 plastic Polymers 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 5
- 239000006096 absorbing agent Substances 0.000 description 4
- 239000000969 carrier Substances 0.000 description 4
- 238000009713 electroplating Methods 0.000 description 4
- 230000035939 shock Effects 0.000 description 4
- 239000008237 rinsing water Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 230000000873 masking effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000004922 lacquer Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 239000006223 plastic coating Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F7/00—Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objects; Servicing or operating
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
- C25D17/06—Suspending or supporting devices for articles to be coated
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/02—Electroplating of selected surface areas
- C25D5/022—Electroplating of selected surface areas using masking means
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D7/00—Electroplating characterised by the article coated
- C25D7/04—Tubes; Rings; Hollow bodies
Definitions
- the frame technology is also disadvantageous because of the two-part masks to be used, including the power leads. It is not possible to use tubular electrodes to enclose the rod in the electrochemical cell with the known frames, since a rod usually fastened to the frame on both sides cannot be inserted into such an electrode. For this reason, the electrodes are divided and only face the rods on two sides. As a result, no uniformly thick layer is deposited on the rods: on the
- a plating rack for holding a plurality of rod-shaped, preferably cylindrical objects, such as, for example, piston rods has been proposed in DE 25 24 31 5 A1.
- the cylindrical rods accommodated in sleeve-shaped receiving parts should be coated on the circumference with a layer thickness that is as uniform as possible.
- the rods be used during the electrochemical process Treatment to rotate around its longitudinal axis.
- Electroplating of elongated, cylindrical bodies disclosed. These bodies are arranged concentrically in tubular anodes and fastened at one end in a stepped metal core. The cathodic current is supplied via this metal core. The metal core is separated from the electrolytic cell by an insulating body.
- the metal core and the insulating body limit the electroplating layer at the upper end of the material to be treated.
- the lower end is protected from unwanted galvanization by a protective sheet.
- the present invention is therefore based on the problem of to avoid parts of the known methods and devices and in particular a uniform electrochemical treatment of the elongated objects, a simple shielding of the objects on the areas not to be treated, whereby an exact limitation of the areas to be treated with narrow tolerances is achieved, a low carryover of the treatment liquids and To enable rinsing water from one bath to the following and an inexpensive electrochemical treatment of objects with different dimensions. In addition, many objects should be editable at the same time.
- the method and the device can preferably be used to coat cylinders for vehicle shock absorbers and other rod-shaped parts, such as, for example, poppet valve shafts.
- the invention is not limited to the treatment of round bars; objects with other cross-sections can also be treated.
- an individual electrolytic cell with defined adjustable masks with sealants in the form of sealing sleeves is provided on both rod ends to delimit the surfaces to be treated.
- the single cell essentially comprises an electrode with a cavity, which is preferably tubular is well-trained. This is arranged essentially vertically in the immersion bath. As a result, the rods can be lowered into and preferably lifted out of the immersion bath in a preferably vertical position, so that the amount of carry-over from one bath to the next is minimized.
- Each rod is inserted into such a single cell.
- the tubular electrodes are as long as required for the longest rod to be treated.
- the area to be treated electrochemically on the object is adjusted by a relative axial movement of the object and the shielding mask to one another. Another possibility is to adjust the area to be treated electrochemically on the object by the depth of immersion of the object in the immersion bath.
- the shielding mask is designed as a sheath partially enclosing the object in the axial direction.
- a sealant is also provided on the shielding mask, which is in contact with the wall of the cavity.
- the shell is preferably tubular. The mask closes in the axial direction with the sealant, preferably in the form of a sleeve.
- the rod to be treated is inserted concentrically into the electrode until the product carrier is put down.
- the sealant has an opening for inserting the object.
- the sleeve is circular and the opening in the middle of the sleeve is provided.
- the shielding mask is held in the immersion bath by a suitable means (holder). Furthermore, a device for axial height adjustment of the shielding mask is provided.
- a lower shielding mask can also be arranged in the electrodes.
- the bath flow is fed to the objects via the product carrier and the electrically conductive grippers.
- the individual electrodes are connected individually or together to the opposite pole of the bath current source.
- sealing means In order to be able to treat objects with different dimensions electrochemically, further preferred embodiments of the sealing means are proposed: For the treatment of elongated objects, for example rods with varying diameters, two sealing means in the form of sleeves lying on top of one another can be used, each of which has an opening for insertion of the object through which it is passed, and radial incisions running towards the openings, wherein the incisions of the two sealants are arranged offset from one another. Furthermore, a plurality of sealing means lying one above the other in the form of sleeves can also be provided, which have openings for inserting the object with different diameters. To increase the mechanical flexibility of the sealing means at the point of penetration for the rods, sealing means with a thickness that decreases towards the opening are preferably used.
- the envelope surrounding the object can also be extended into the area to be treated electrochemically.
- Another preferred embodiment is to use perforated electrodes. This makes it possible to convey the treatment liquid contained in the immersion bath against the object through the perforations in the electrode in order to achieve a targeted flow and thus influence the electrochemical treatment process.
- Figure 1 Goods carrier for transporting the material to be treated through the immersion bath system
- the goods carrier shown in Figure 1 consists of a multi-part frame 1, which is placed on the frame supports 2 on the container for the treatment liquid.
- Pliers-shaped grippers 3 are attached to the frame.
- the grippers consist of a fixed leg 4 and a movable leg 5. The latter is rotatably mounted with an axis 6 in the leg 4.
- the clamping jaw 8 on the fixed leg is curved inwards with a cross section that is preferably trapezoidal.
- the clamping jaw 9 on the movable leg has the outwardly curved, spherical profile shown.
- Rods 10 with different shaft diameters can thus be gripped. When gripping, they are aligned exactly in the longitudinal direction of the gripper in the prism-shaped jaw. In the illustration in FIG. 1, the rods are arranged vertically.
- the jaws 8 and 9 can also be attached to the legs in a reversed configuration.
- Cuff 24 which has a concentric hole, closed.
- a tubular electrode 30 is installed stationary for each individual cell 22.
- the electrodes are fastened in an electrically conductive manner in an electrode insert 31.
- the insert is oriented so that the rods to be treated are positioned centrally in the tubular electrode 30 when the product carrier is put down.
- the height of the upper and lower panel supports is set on the basis of these setpoints via the fine adjustment devices 20, 28.
- the actual height values are reported back to the control system from the system.
- This device enables a precise, partial treatment of rods with very different dimensions in a bath container without having to change this or the goods carrier.
- the polarity of the bath current supply lines is shown in FIGS. 2a and 2b for an electrochemical metallization. The polarity given in brackets applies to the electrochemical etching process.
- the rod 10 to be treated can generally have a plurality of screwed-on shoulders 30, some with threads.
- the clamping jaws 8 and 9 grip the rod at the attachment 33.
- the rod is touched at one point via the clamping jaws 9, a half-cylinder, and is printed into the p ⁇ smen-shaped clamping jaw 8 for exact alignment.
- Both jaws are made of a wear-resistant, corrosion-resistant and electrically conductive material. It is advisable to attach the jaws to the legs of the grippers in an interchangeable manner.
- the tubular masks 23, 26, which are arranged in the electrode 30, can be adjusted in height. They are arranged concentrically to the electrode.
- FIG. 5 shows such a curvature of the cuff, which is achieved by a downward movement of the rod.
- the cuff has a multilayer pinnate structure. This allows the treatment of rods with large differences in diameter at the delimitation point 37. With a long service life of the sleeves, rods with very different rod diameters can also be produced in one system. Such is shown in FIG Cuff shown.
- the individual layers are offset from one another in such a way that the cuts 42 in one sleeve film are covered by the other film. The same applies to other locations. It is also advantageous if the layers have stepped diameters of the central opening 40. In this case, the limitation point
- the layers are gripped by a cuff holder 41.
- the holder is fixed or floating in the mask.
- the sleeves 24, 27 can also be designed such that their thickness decreases in the radial direction from the outside to the center.
- the thickness can decrease continuously, as shown in FIG. 5, or in steps. This has the advantage that the sleeve is very flexible in the penetration area of the rod, although the sleeve is very dimensionally stable in the area of the outer diameter.
- the sleeve consists of electrically non-conductive brushes.
- the brushes are fastened in the cuff holder and point radially to the cuff center. In the case of dense bristles, reliable masking and a long service life are also achieved with this.
- the measures for field-free spaces 38, 39 are essentially met by the measures described above, for example when using feathered sleeves or if the tolerances between the axis of the rod and the axis of the masks 23, 26 are too great, electrical field lines from the treatment space 34 in the largely field-free Penetrate spaces. If the field line density in these rooms is so small that this results in a current density at the end regions of the rod that are not to be coated, which is below the threshold value for an electrolytic treatment, for example a metal deposition, no electrochemical treatment takes place. However, if the field line density in these rooms is so large that the threshold value is exceeded, the areas not to be treated are treated electrochemically. For example, metal is deposited. The resulting layer is considerably thinner than the layer deposited in the area of the treatment room. However, an additional one is undesirable for their removal
- the threshold value in the lower space 39 can be exceeded more easily .
- an enlargement of the metal surfaces located in this space 39, which are at the same electrical potential as the rod, is provided.
- a metallic body 44 is arranged in the center of the space 39. This is freely movable in the axial direction. For this purpose, it is attached to a holding element 45 made of non-conductive material, which is guided in the mask 23.
- the holding element 45 can either as
- Float be formed so that it is pressed upward in the liquid, or it is displaced upwards by a spring 46 arranged between the holding element and the lower diaphragm support 17. In both measures, the metallic body 44 rests on the lower sleeve 24 when there is no rod in the single cell 22.
- the electrode 30 is preferably designed as an insoluble electrode.
- the electrode can be designed, for example, as a perforated tube so that a good electrolyte exchange can take place in the treatment room 34.
- An expanded metal grid from which the electrode is formed is suitable, for example.
- a further electrolyte exchange takes place through the gap 43 (FIG. 3). If the diameter of the masks 23, 26 and the inner diameter of the electrode are the same size and the masks are firmly connected to the electrode, then the gap 43 is omitted. In this case, the electrodes can be adjusted telescopically together with the mask adjustment. In this case, the electrolyte in the treatment room 34 is exchanged solely via the electrode perforations.
- the surface of the electrode must be chemically and electrochemically resistant. Surface coatings
- Platinum or mixed oxides are so stable that the electrodes have a long service life.
- the electrodes are connected to the electrode insert in an electrically conductive manner.
- the bath power source is connected to all electrodes via this insert.
- An individual bath current source can be assigned to each electrode for particularly precise or individual treatment.
- the electrodes are attached to the electrode insert in an electrically insulated manner and connected to the respective current source with an insulated cable. In special cases, the electrode can also be soluble.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
Description
Claims
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19632132A DE19632132C1 (de) | 1996-08-09 | 1996-08-09 | Verfahren zur elektrochemischen Behandlung von stabförmigem Behandlungsgut und Vorrichtung zur Durchführung des Verfahrens |
DE19632132 | 1996-08-09 | ||
DE19722983A DE19722983C2 (de) | 1996-08-09 | 1997-06-02 | Verfahren zur elektrochemischen Behandlung von stabförmigem Behandlungsgut und Vorrichtung zur Durchführung des Verfahrens |
DE19722983 | 1997-06-02 | ||
PCT/EP1997/004341 WO1998006884A1 (de) | 1996-08-09 | 1997-08-07 | Verfahren und vorrichtung zum elektrochemischen behandeln langgestreckter gegenstände |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0874921A1 true EP0874921A1 (de) | 1998-11-04 |
EP0874921B1 EP0874921B1 (de) | 2000-01-12 |
Family
ID=26028257
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97940064A Expired - Lifetime EP0874921B1 (de) | 1996-08-09 | 1997-08-07 | Verfahren und vorrichtung zum elektrochemischen behandeln langgestreckter gegenstände |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0874921B1 (de) |
JP (1) | JP4139439B2 (de) |
ES (1) | ES2142690T3 (de) |
WO (1) | WO1998006884A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012068313A1 (en) | 2010-11-16 | 2012-05-24 | Strategic Resource Optimization, Inc. | Electrolytic system and method for generating biocides having an electron deficient carrier fluid and clorine dioxide |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19822196C2 (de) * | 1998-05-16 | 2000-05-11 | Lemfoerder Metallwaren Ag | Verfahren zur selektiven bereichsweisen Beschichtung metallischer Bauteile und Vorrichtung zur Durchführung des Verfahrens |
JP4910347B2 (ja) | 2005-09-27 | 2012-04-04 | トヨタ自動車株式会社 | スペーサを兼ねた集電電極を備えた燃料電池セルモジュール |
WO2015055537A1 (de) * | 2013-10-17 | 2015-04-23 | Damm Oberflächentechnik Gmbh & Co. Kg | Verfahren und vorrichtung zum beschichten von kopfstützbügeln oder kopfstützstangen |
CA2970332C (en) * | 2014-12-19 | 2019-03-12 | Weber-Hydraulik Gmbh | Method for optically inscribing and/or marking round stock |
JP6282773B1 (ja) * | 2017-06-30 | 2018-02-21 | 株式会社ショーワ | マスキング治具、電気メッキ装置 |
CN108637604A (zh) * | 2018-05-14 | 2018-10-12 | 山推工程机械股份有限公司 | 一种油缸轴的制备方法 |
WO2024095404A1 (ja) * | 2022-11-02 | 2024-05-10 | 日立Astemo株式会社 | マスキング治具、電気メッキ装置 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2462490A1 (fr) * | 1979-08-03 | 1981-02-13 | Centre Techn Ind Mecanique | Dispositif de revetement electrolytique |
IT1138370B (it) * | 1981-05-20 | 1986-09-17 | Brev Elettrogalvan Superfinitu | Metodo e apparecchiatura a doppia vasca,per la cromatura in continuo di barre e di pezzi di grosse dimensioni,con riciclo per la eliminazione dell'idrogeno |
FR2578859B1 (fr) * | 1985-03-12 | 1989-09-08 | Commissariat Energie Atomique | Appareillage et installation de realisation d'un depot metallique electrolytique d'epaisseur constante. |
-
1997
- 1997-08-07 ES ES97940064T patent/ES2142690T3/es not_active Expired - Lifetime
- 1997-08-07 JP JP50938898A patent/JP4139439B2/ja not_active Expired - Lifetime
- 1997-08-07 WO PCT/EP1997/004341 patent/WO1998006884A1/de active IP Right Grant
- 1997-08-07 EP EP97940064A patent/EP0874921B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9806884A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012068313A1 (en) | 2010-11-16 | 2012-05-24 | Strategic Resource Optimization, Inc. | Electrolytic system and method for generating biocides having an electron deficient carrier fluid and clorine dioxide |
Also Published As
Publication number | Publication date |
---|---|
ES2142690T3 (es) | 2000-04-16 |
WO1998006884A1 (de) | 1998-02-19 |
JP4139439B2 (ja) | 2008-08-27 |
EP0874921B1 (de) | 2000-01-12 |
JP2000516303A (ja) | 2000-12-05 |
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